[URL="http://api.tweetmeme.com/share?url=http://sports.espn.go.com/nfl/news/story?id=6012764&campaign=rss&source=NFLHeadlines&service=bit.ly&source=espn"][IMG]http://api.tweetmeme.com/imagebutton.gif?url=http://sports.espn.go.com/nfl/news/story?id=6012764&campaign=rss&source=NFLHeadlines[/IMG][/URL]NFL union executive committee members Scott Fujita and Domonique Foxworth say concerns about injuries make the league's push to switch to an 18-game regular season a major sticking point in negotiations for a new collective bargaining agreement.